Pastor's 403B setup

[blsvcma]

I have a question on setup for 403B for pastor. We have the tax table set up for his 403B to deduct 10% from his income(s).
However, when we do his payroll, it only takes out 10% of his salary. It does not deduct 10% from his parsonage allowance or his social security allowance. When I go into edit item, it is set for a manual amount, but I do not have the tax table set up as a manual amount. The tax table is set up for 10% deduction. I change it on the edit item to a percentage, and it makes the correction, but surely I wouldn't have to adjust this every payroll? Shouldn't it draw the 10% deduction from the tax table?
Thanks in advance.

[Zaina]

What version of PowerChurch Software are you using? Is the housing and social security allowance set up as taxable income?